The strike will hit both the carrier's passenger and cargo flights

Lufthansa (DLAKY) says that the three-days strike will force it to cancel 3,800 flights. The union voted to approve the strike in protest of plans to alter retirement benefits. The strike will disrupt Lufthansa operations between Wednesday and Friday, costing Lufthansa millions of euros, the Wall Street Journal notes.

Both passenger and cargo flights will be affected by the Lufthansa pilot’s strike. Talks between Lufthansa and the union have so far failed to resolve the impasse, but both sides had signaled a willingness to continue discussions.

The strike comes on the heels of other unions work actions at several German airports that have affected Lufthansa operations over the past few months.